Second power system modeling and performance analysis
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摘要:
为分析飞机第二动力系统的整体工作特性,采用部件级建模方法和多种群遗传算法对包含辅助动力装置(APU)、引气管路和空气涡轮起动机(ATS)在内的第二动力系统进行稳态建模。利用参考数据对比验证了仿真模型的可靠性,仿真结果误差小于3.5%。仿真计算得到引气管路的损失特性和APU、ATS的工作特性,针对整体系统开展仿真分析得到系统的温度特性、高度-速度特性、负载特性,结果表明引气管路的效率会随引气参数发生显著变化,第二动力系统各部件工作存在耦合关系,系统的当量功率等总体性能参数随高度增加而衰减,系统效率随飞行速度的增加而下降,研究结论为先进第二动力系统设计提供参考。
Abstract:In order to analyze the overall working characteristics of the second power system of aircraft, a component-level modeling method and multi-population genetic algorithm were used to model the second power system, which consisted of the auxiliary power unit (APU), exhaust pipe and air turbine starter (ATS). The reliability of the simulation model was verified by comparison with the reference data, and the error of the simulation results was less than 3.5%. The loss characteristics of the bleed air pipeline and the working characteristics of APU and ATS were obtained by simulation calculation. The temperature characteristics, altitude velocity characteristics and load characteristics of the system were obtained by simulation analysis for the whole system. The results showed that the efficiency of the bleed air pipeline changed significantly with the bleed air parameters, and there existed a coupling relationship between the components of the second power system. The overall performance parameters such as the equivalent power of the system decreased with the increase of altitude, and the efficiency of the system decreased with the increase of flight speed. The research conclusion can provide a reference for the design of advanced second power system.
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表 1 引气管路模型仿真校验
Table 1. Bleed air pipeline model simulation and verification
工况 数值结果 模型结果 误差/% 1 0.9950 0.9937 0.13 2 0.9949 0.9936 0.13 3 0.9948 0.9936 0.12 表 2 仿真结果验证(1)
Table 2. Verification of simulation results (1)
工况 参数 参考值 仿真值 误差/% 1 负载压气机功率/kW 209.0 210.2 0.6 动力压气机功率/kW 620.0 616.8 0.5 引气压力/kPa 313.0 311 0.6 引气温度/K 458.0 455.8 0.5 ATS流量/(kg/s) 1.038 1.035 0.3 ATS功率/kW 90.0 89.9 0.1 2 引气压力/kPa 299.0 300.1 0.4 引气温度/K 473.0 468.4 1.0 ATS流量/(kg/s) 0.970 0.984 1.4 ATS功率/kW 84.0 84.91 1.1 3 引气压力/kPa 339.0 335 1.2 引气温度/K 435.0 419.91 3.5 ATS流量/(kg/s) 1.14 1.15 0.9 ATS功率/kW 98.0 100.0 2.0 表 3 仿真结果验证(2)
Table 3. Verification of simulation results (2)
工况 参数 参考值 仿真值 误差/% 1 涡轮前温度 1.000 1.015 1.5 排气温度 1.000 1.002 0.2 引气压力 1.000 1.023 2.2 引气温度 1.000 1.033 3.2 2 涡轮前温度 0.996 1.009 1.3 排气温度 0.992 0.995 0.2 引气压力 0.906 0.919 1.5 引气温度 0.988 1.0184 3.0 3 涡轮前温度 0.992 1.001 0.9 排气温度 0.986 0.984 0.2 引气压力 0.819 0.825 0.8 引气温度 0.973 1.0082 3.4 -
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